You could hook it up to a measured load, to test it?  
I'm not sure what the combined wattage of the lights are, but I imagine a 1 x 100w (12 volt) bulb would set it off? 
What wattage are the original headlight bulbs?  
At 12 volt, they will be 6 to 24 watt bulbs x 2, plus the two tail light bulbs at a further 6 watts each? Total=60 (ish)?  
A 100 watt load can't be far off?
		 
		
		
		
		
		
		
			
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				Bluebell 
 
Carrier Armoured O.P. No1 Mk3 W.  T84991 
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. 
Dodge WC55. 37mm Gun Motor Carriage M6 
Jeep Mb #135668 
So many questions....
			 
		
		
		
		
		
	
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